The crew joins forces with Vulcan authorities to investigate a deadly bombing of Earth's embassy, which may be the work of a sect devoted to the logical teachings of Surak, the father of Vulcan philosophy.

As Vulcan prepares for war, V'Las sends a commando team to eliminate Archer, T'Pol and T'Pau, while Soval risks his sanity to warn the Andorians of the impending attack.